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Getting Started with rMosaic

Introduction

rMosaic provides R bindings for Mosaic 0.21.1, a framework for declarative, interactive, and scalable visualizations. This vignette demonstrates basic usage with a working example.

Installation

install.packages("rMosaic")

Example: Voronoi Diagram with YAML

This example demonstrates a Voronoi diagram with interactive controls using YAML format. The visualization includes: - Voronoi cells colored by species - Convex hulls around each species group - Delaunay mesh connecting points - Interactive menus to toggle hull and mesh visibility

library(rMosaic)

# Generate synthetic penguins dataset
set.seed(42)
penguins_df <- data.frame(
  bill_length = rnorm(150, mean = 40, sd = 5),
  bill_depth  = rnorm(150, mean = 18, sd = 3),
  species     = sample(c("Adelie", "Gentoo", "Chinstrap"), 150, replace = TRUE)
)

# Define YAML spec as R list
voronoi_yaml <- list(
  params = list(
    mesh = 0,
    hull = 0
  ),
  vconcat = list(
    # Main plot
    list(
      plot = list(
        list(
          mark = "voronoi",
          data = list(from = "penguins"),
          x = "bill_length",
          y = "bill_depth",
          stroke = "white",
          strokeWidth = 1,
          strokeOpacity = 0.5,
          fill = "species",
          fillOpacity = 0.2
        ),
        list(
          mark = "hull",
          data = list(from = "penguins"),
          x = "bill_length",
          y = "bill_depth",
          stroke = "species",
          strokeOpacity = "$hull",
          strokeWidth = 1.5
        ),
        list(
          mark = "delaunayMesh",
          data = list(from = "penguins"),
          x = "bill_length",
          y = "bill_depth",
          z = "species",
          stroke = "species",
          strokeOpacity = "$mesh",
          strokeWidth = 1
        ),
        list(
          mark = "dot",
          data = list(from = "penguins"),
          x = "bill_length",
          y = "bill_depth",
          fill = "species",
          r = 2
        ),
        list(mark = "frame")
      ),
      width  = 680,
      height = 480
    ),
    # Interactive controls
    list(
      hconcat = list(
        list(
          input   = "menu",
          label   = "Delaunay Mesh",
          options = list(
            list(value = 0,   label = "Hide"),
            list(value = 0.5, label = "Show")
          ),
          as = "$mesh"
        ),
        list(hspace = 5),
        list(
          input   = "menu",
          label   = "Convex Hull",
          options = list(
            list(value = 0, label = "Hide"),
            list(value = 1, label = "Show")
          ),
          as = "$hull"
        )
      )
    )
  )
)

# Run the application
runMosaicApp(
  spec     = voronoi_yaml,
  specType = "yaml",
  data     = list(penguins = penguins_df),
  title    = "Voronoi Diagram (YAML)"
)

Key Features

Next Steps

Explore other vignettes: - format-json.Rmd: Same visualization using JSON format - format-esm.Rmd: Same visualization using ESM (JavaScript) format - taxi-crossfilter.Rmd: Multi-view crossfilter example - athletes-dashboard.Rmd: Complex dashboard with tables and selections - gaia-stars.Rmd: Large-scale astronomical data visualization - dynamic-rendering.Rmd: Dynamic pan/zoom with on-the-fly binning

Check the Mosaic documentation for all available marks and interactions.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.